How i can set a value of specific column in a lookup?

    SysTableLookup sysTableLookup = SysTableLookup::newParameters(tableNum(NumberSequenceGroup), this);


    sysTableLookup.addLookupField(fieldNum(NumberSequenceGroup, NumberSequenceGroupId));
    sysTableLookup.addLookupField(fieldNum(NumberSequenceGroup, Description));
    sysTableLookup.addLookupField(fieldNum(NumberSequenceGroup, MainAccountId));


    queryBuildDataSource = query.addDataSource(tableNum(NumberSequenceGroup));


    sysTableLookup.parmQuery(query);
    sysTableLookup.performFormLookup();